COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1637

                                   Konkoly Observatory
                                   Budapest
                                   1979 July 6




          B V OBSERVATIONS OF V 1057 CYGNI




    Winnberg and Walmsberg (1979) found that this unusual FU Ori
type variable star flared up again in the 1720 MHz OH line on
May 30, 1979.
    On six plates (Orwo ZU2) taken with the f/5 fourlens astrograph 
of the Observatorium Hoher List, B magnitudes were estimated. 
Photoelectric observations were made with the 75 cm telescope
of the Wilhelm Foerster Observatory, Berlin, an uncooled 1P21 
photomultiplier and Schott filters BG 12 + GG 13 for the B band and
GG 11 for the V band. Comparison star data are adopted from
Landolt (1975). Table I lists all magnitudes. The mean of the
photographic observations is B=12.8m +- 0.1m, 1978.6 the mean of the
photoelectric observations is B=12.66m +- 0.01m, B-V=+1.79m+-0.01,
1979.5. Herbig (1977) collected all available observations up to
1977 and determined an average fading rate of 1.7m/6 yrs. since the
outburst in 1970. From this rate, one expects in 1978.6 a B 
magnitude of 12.74m which is in good agreement with our photographic
results. For 1979.5 one would expect B=12.99m which is 0.33m less
than the listed photoelectric B magnitude. Thus, a small optical
outburst may be possible, too.
    We have to thank the Observatorium Hoher List for the possibility 
to use the astrograph of the institute.


         U. HOPP, M. KIEHL,  S. WITZIGMANN
	 Wilhelm Foerster Sternwarte
         Munsterdamm 90    
	 D 1000 Berlin 41

References:
Herbig, G.H., 1977 - Astrophys.J. 217, 693 [BIBCODE 1977ApJ...217..693H ]
Landolt, A., 1975 - Publ.Astron.Soc.Pacific 87, 379 [BIBCODE 1975PASP...87..379L ]
Winnberg, A., Walmsley, C., 1979 - IAUC 3364 [BIBCODE 1979IAUC.3364....1W ]


              Table I

Date (J.D. geo.) B          B-V       Method

2443715.396d  12.7m+-0.1m               pg
   3717.439   12.9                      pg
   3718.431   12.8                      pg
   3719.406   12.9                      pg
   3723.499   12.9                      pg
   3725.474   12.8                      pg
   4044.476   12.65+-0.04 +1.78m+-0.04m pe
   4045.488   12.68       +1.80         pe
   4046.479   12.66       +1.68:        pe
           
     The error in V is about +-0.01m.